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NEETZoologyPrinciples of Inheritance and Variation

A couple has four children, and interestingly, each child has a completely different blood group: A, B, AB, and O. Which of the following represents the correct genotypes of the parents?

Options

  1. AI^ A I^ A and I^ B I^ B
  2. BI^ A I^ B and ii
  3. CI^ A i and ii
  4. DI^ A i and I^ B i

Correct answer

D. I^ A i and I^ B i

Step-by-step solution

For a child to have blood group O, their genotype must be ii , which means they must inherit one i allele from each parent. Therefore, both parents must carry at least one recessive i allele. For a child to have blood group AB, their genotype must be I^ A I^ B , which means one parent must provide the I^ A allele and the other must provide the I^ B allele. Combining these deductions, one parent must have the genotype I^ A i and the other must have the genotype I^ B i . A cross between I^ A i and I^ B i yields offsp

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